Stitching machine



Jan. 4 1927.

E. LESCHHRN sTITcHNG MACHINE Patented Jan. 4, 1927.

UNITED STATES ERNEST LESCHHORN,

OF CHICAGO. ILLINOIS, ASSIGNOR TO LATI-IAM MACHINERY? COMPANY, ACORPORATION OF ILLINOIS.

STITCHING MACHINE.

Application mea February e, 1924. seriai No. 690,894.

This invention relates to wire stitching machines and more particularlyto improve-V ments in clinching mechanism therefor.

@ne et the objects ot the present invention is to provide a simple andefficient clinching mechanism.

A still further object ot the invention 1s to provide an improvedclinching mechanism which will positively drive the ends ot' the stapleinto the material being operated upon in such a manner that it gives aneater and more finished appearance to the work.

still 'further object of the invention is to provide an improvedclinching mecha nism which is constructed ot a minimum number ot'movable parts.

These and other objects are accomplished by providing a construction andarrangement of the various parts in the manner hereinafter described andparticularly pointed out in the appended claims.

Referring to the drawings, Fig. 1 is a front elevational view of myimproved clinching mechanism showing the same removed trom the stitchingmachine.

2 is a top plan view of Fig. 1.

Fig. 3 is a side elevationalview of my improved clinching device shownin Fig. 1.

Fig. 4 is in section showing my improved clinching mechanism in theoperation of clinching the ends of the staple. 1

Fig. 5 is a front elevational view partly in section showing my improvedclinching mechanism completing the operation of clinching a staple, and

Fig. 6 is a perspective view showing the improved construction or" theIclinching members.

In carrying out my invention I have shown my improved clinchingmechanism preferably consisting of a detachable bracket 107 which isadapted to be secured to the work arm of a stitching or stapling machineof most any well known type. For detachably securing this bracket 10 tothe work arm I have provided two apertures 11 located on the oppositeends thereof, which may be adapted to receive boltsy for securing thebracket in place. Formed integrally with the bracket and positionedcentrally on one side thereof is a rectangular wall 12 of substantiallyone third the thickness of the bracket 10. This wall 12 is provided witha horizontally disposed recess 18 which a front elevational view partlykextends longitudinally of the bracket in suclr a manner as to formshoulders 14 on the opposite ends of the wall. Extending verticallythrough the vertical center of the bracket adjacent the wall 12 is arecess 15. This recess 15 1s positioned in the same vertical plane andcommunicates with the horizontal recess 13 in the bracket 10. Pivotallymounted on the opposite ends of the wall within the horizontal recess 13are two oppositely disposed clinchingl members 16, which are mounted onpins 17. These clinching members 16 are provided with channels orgrooves 18 on the upper edge thereof and are slightly larger as shown at19 at the outer ends thereof. These grooves 18 are adapted to receiveand guide the lower ends ot the staple in the operation of clinching thestaples in the work. The inner ends ot these pivoted clinching membersare provided with angular-ly disposed notches 20 and stop portions 21.The notches 20 are adapted to be engaged by the upper opposite ends 22of the reciprocating clinching member 23 positioned in the verticalrecess 15 of the bracket 10. The reciprocating clinching member 23 isprovided with a horizontal groove 24, which co-operates with the grooves18 in the pivoted clinching members 16 in the operation of clinching thelower end of the staple. The reciprocating clinching membery 23- isprovided on its opposite sides thereof, adjacent the upper end, withcut-out portions 25. This construction permits the lower end or stopportions 21 ot the pivoted clinching members 17 to swing inwardly abouttheir pivots as the reciprocating clinching member 23 is actuatedupwardly to clinch the staple. mechanism is completely encased bypositioning a side plate 26, which is of substantially the sameconguration as the wall 12 on the side opposite the wall. This plate 26is secured in position by screws 27 which are adapted to be received inthreaded engagement with the threaded apertures 28 of the bracket 10.

When the material 29 to be stapled is placed in the stitching machineabove the clinching mechanism, the staple 301s driven through the workby the staple driver 81, which is shown in dotted lines in Fig. 4. Whenthe staple driver is driving the staple into the work the pivotedclinching members 16 are positioned so that their stop por- Theclinching tions 21 engage the shoulders 14 of the recess 13 and positionthe upper or grooved edges 18 at an inclined plane, or the positionshown in Fig. 1-, and as the staple 30 is being driven 'through theworl; the 'lower portions of the legs of the vstaple are guided by thegrooves 18 of the clinchingniembers 16 and simultaneously with thecompletion of the driving stroke l'of the driver the reciprocatingclinching member 23 is actuated upwardly, which in turn actuates thepivoted -clinching members 16 about their pivots on the -pins 17 tocompletely and positively clinch 'the lower 4ends of the staple in thework, thus providing a clinching mech-- anism, which is simple inconstruction and eiiicient in operation, in that there are only threemovable aparts which :co-operate to completely and neatly ,clinch thestaples in the work. In this connection i-t will be noted that when thereciprocating member is actuated to its uppermost `position the pivotedclinching members 16 lare actuated to a position beyond their normalclinching position as shown in Fig. in which the free end-s of thestaple are pressed orcaused to be embedded in the work being stapled insuch a manner that the staple is securely fastened in the clinchedposition.

It will of course be understood thatthe reciprocating clinching member23 is operatively connected with the stitching machine in a manner wellknown in the art so that the clinching mechanism yand the drivingmechanism are co-operaftively driven together.

While in the above specification I have described one embodiment whichmy invention may assume in practice, it will, lof course, be understoodthat the same is capable of modification, and that modification may bemade without departing from the spirit and scope of the linvention aseX- pressed in the following claims.

Vhat l claim as my invention and desire to secure by Letters Patent is:

1. in a stapling machine, the combination with means for driving thestaple through the work, of pivotedV olincher means having notchestherein, a reciprocable clinclier member having an active clinchingsurface 'adapted to engage the pivoted clincher means for actuating'said clincher means beyond their normal clinching position for clinchingthe staple in the work.

2. in a stapling machine, the combination with means for driving thestaple through the werlf, of two oppositcly disposed pivoted clinchermembers for bending` the legs of the staple, a reciprocable .cher memberoperatively related to said ci icher members and engageable with bothlegs of said staple for finally clinching them in the work and meanswhereby said clincher members may be actuated beyond their normalclinching position for positively clinching the endsof the staple.

El. A clinching mechanism for a stapling` machine comprising asupporting bracket having a vertical open WVtlic-rethrough andhorizontal slots communicating with said vertical opening, clinchingmembers pivotally mounted in said horizontal slots, stops formedAintegrally with said clinching mem` bers adapted for engagement withthe bottom surfaces of said horizontal slots, .and a verticalreciprocating clincher member cooperating with and actuating said iirstmentioned clincher members in a manner to rotate said members cn theirrespective pivotal connections beyond their-normal clinching position.

ln testimony whereof I lhave signed my name to this specification, onthis second day of February, A. D. 1924.

ERNEST LESCHHORN.

